1) Move the Show view filter (Unwatched/In progress/All/Watched/Hidden) up into the
toolbar chip row as its own single-select group, divided from the content-type chips;
removed the 'show' sidebar widget (sidebar now = Upload date / Language / Topic).
2) Rework ordering like the Playlists page: a sort-key dropdown (Date, Popular, Duration,
Name, Channel subscribers, Channel priority, Surprise me) + a single asc/desc arrow
toggle, instead of separate directional entries. 'Most viewed' is now 'Popular'.
Backend gains the missing directions (views_asc, title_desc, subscribers_asc,
priority_asc); the frontend maps (key, dir) -> the backend sort string, so FeedFilters
is unchanged. Trilingual (feed.sortKey.*, feed.dirAsc/dirDesc). Feed.tsx normalized to LF.
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